Albert schmid



(No Model.)

A. SCHMID. ARMATURE GORE FOR DYNAMO ELE No. 361,896.

0mm MACHINES.

Patented Apr. 26, 1887.

WITNESSES:

UNITED STATES PATENT OFFICE.

ALBERT SCHMID, OF rrr'rsnnne, PENNSYLVANIA, ASSIGNOR TO THE WEST- INGHOUSE ELECTRIC COMPANY, OF-SAME PLACE.

ARMATURE-GOREFO'R D'YNAMd-TELEGTRIC MACHINES.

SPECIFICATION forming partof Letters Patent No. 361,896, dated April 26, 1887. v

Application filed July 29, 1886. Serial No. 209,366. (No-modal.)

To all' whom itimay concern: I

Be it known that'l, ALBERT SoHMID, residing' at Pittsburg, in the county of Allegheny and State of Pennsylvania, a citizen of'the United States, have invented or discovered certain new and useful Improvements in Cores for'Armatures, of which improvements the following is a specification.

In the accompanying drawings, which make part of this specification, Figure 1 is a central sectional view of myimproved armature core for dynamo-electric machines, showing the arrangement of the disks and retainingplates. 1

Fig. 3 is a sectional detail view showing. the manner of insulating the disks forming the core of the armature.

. Heretofore in forming the cores for the ar matures for dynamo-electric machines the metal disks composing the core were stamped out of suitable sheet metal, and when arranged on the shaft were turned ofi on their outer edges to produce a true cylindrical surface.

As, however, the disks were formed of soft metal, fins would be formed at their edges, and

by the action of the cutting-tool would be bent over, and, bridging the intervening insulating sheets or disks, would formelectrical connection with the adjoining metal disk, thereby destroying the effectiveness of the armature- The object of the invention herein is to so form the metal disks as to avoid the necessity of subsequent turning or trimming in order to bring the disks to a uniform size when placed .in the shaft; and it .is a further object of said invention to protect the edges of the disks as against any liability of adjacent disks being electrically'connected. v

.In general terms, the invention consists in the construction and combination of parts, substantially as hereinafter described and claimed.- v

In manufacturing my'improved core, sheets of any suitable metal are first centrally punched to form the holes for the receptionof the shaft 1, and the sheets are then placed in a rotary shears and cut-into disks of a uniform diameter, thusinsuring auniformdiamcter of core when the disks are arranged on the shaft, without resorting to subsequent trimming or turning Fig. 2 is an end elevation of the core.-

core a retaining-disk, 3, is first slipped'onto.

the shaft up to the shoulder 4, and there secured as against rotation on the shaft by a key, 5. '(See Figs. 1 and 3.) A disk, 6, of insulating material, is then placed next to the disk 3, then one of the metal disks 2, and next .an insulating -'disk, 6, and so on until about midway of the length of the core. At this point another retaining-disk 3 is placed. The remainder of the core is made up of alternate disks. of metal and insulating material, as shown, the whole being held together by another retaining-disk 3 and a nut, 7,' screwing onto the shaft and forcing all the disks firmly together. The outer retaining-disk '3 and the through the disk and nut and screwing into the-shaft 1.

The insulating-disks 6, which may be formed 1 of paper or other insulating material, are of a diameter sufficiently greater than the diameter of the metal disks 2 to cause them to project a short distance beyond the-edges of the metal disks, as shown in Fig. 3, and previous to their being placed in position between the metal plates are saturated with shellac, glue, 8m. After the metal and insulating disks have been placed together, as above described, the projecting edges of the insulating-disks are folded down over the. peripheries of the disks 2, as shown in Fig. 3.

The insulating-disks project sufiiciently beyond the disks 2 to lap one upon the other when folded as above stated, thus-completely covering and protecting the edges of the metal disks, the overlapping edges being secured together by'thc shellac or glue.

A series of pins, 9, are inserted in the pe-.

ripheries of the retaining-disks 3, said pins serving to hold the wires which are wrapped around the core in place.

I claim herein as my invention--- 1. A core for armatures having in combination a series of metallic disks and a series of insulating-disks arranged between the metallic disks, the edges of the insulating-disks being folded down over the edges of the metallic disks, substantially as set forth.

, 2, and a series-of insulating-disks arranged benation a series of metallie'disks and a series tween the metal disks, the edges of the insuof insulating-disks arranged to-alternate .with lating-disks being folded down over the edges the metallic disks, the edges of theinsulating-- "of the metallic disks, substantially as set forth. I 5 5 disks projecting beyond the edges of the me-' In testimony whereof I have hereunto set tallic disks, thereby insuring theuperfect insumyha'nd. lation of each metallic disk from those adja ALBERT SCHMID.

2. A core'for armatures having in eombt cent thereto, substantially as set forth, i Vitnesses: 3. A core for 'armatures having in c0mbi- DARWIN S. \VOLCOTT, to nation the retaining-disks 3, provided with ra- 1;. H. WHITTLESEY.

d-ially-projeeting pins, a series of metal disks, 

